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In Reply to: RE: delta 100 hum posted by tdbr8de on June 14, 2010 at 15:19:11
Obviously a ground loop. The clue is that neither amp does it alone.
I would start by taking an RCA cable and connecting it between the two amp's inputs. This would mean no actual input, you are just tying the two input grounds together through the single RCA cable between the amps. I am assuming the hum will appear. If it appears in both amps then you should be able to get rid of it through disconnecting the AC grounds. If it is only in one amp and always the same amp, then you might have to have this amp looked at.
Use this as your baseline. Try cheating the 3d prong on both amps, just one, etc.
Follow Ups:
sorry i didn't explain better. i bought the second amp because the original one had the hum. the hum only occurs when both input channels have an rca connector plugged in. the older post that i copied described the same problem. my question was/is does anyone know the fix. i sent it to a shop in the new orleans area but no luck.
Did you try my suggestion? Take a single RCA cable and connect the two inputs together and see if it hums. Let me know what you find.
sorry for the delay. i had to assemble things.
the amp still has the hum/buzz with inputs linked together. i had a shop in the new orleans area inspect the amp and they eliminated some of the buzz/hum but not all of it. (it was more pronounced in one channel)
i suspect power supply caps. this looks like the earliest model delta 100. i know there are at least three design changes. all three have different placement of the caps and rectifiers with the oldest being closest to the circuit boards. i guess i have to call cullen...
Why don't you have the caps replaced?
i'll probably have that done but i'm getting to the point of diminishing returns.
this version of the amp is the one with four 6800uf 63vdc caps per channel soldered directly to the circuit board. replacement may drive the price of the amp above the threshold however what is it worth as is?
thank you very much for your time and advice. it means a lot when someone with your credentials takes the time to help with questions.
tim
Thanks. I just like to make sure all of our products continue to bring enjoyment to people for many, many years. Let us know if we can help.
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